*sigh* ANOTHER mobo and CPU problem.

After finally getting back a new, good motherboard and installing windows at 27 - 31C on stock cooling, I ran into a problem. The thing is I did NOTHING that could have screwed something up. I simply checked temps, installed windows, had fun, turned off and went to sleep. The computer was running fine for 5 or 6 hours, but after I woke up the next morning, the CPU fan was weird.

So now, after pushing the power button, I can see the fan moving for 1 second, stopping, then trying to move over and over. It's pissing me off because I did abolutly nothing I hadn't done before before turning out the light. (Besides plugging in a ethernet cable, which I doubt did anything). I don't get any beeps or anything, I've never overclocked, and I've never changed anything in CMOS. I also reset CMOS just in case, but I got nothing. Any suggestions?

sorry, I had a loose video connection. I guess it is, because I'm getting 23C right now. It just seemed odd to me how the fan looked as if it were TRYING to spin, and it still does...should I be concerned?